I have found a helpful way to freshen up at the end of the hiking day. I take about 6 oz. of water and place in a freezer bag, propping it up so it won't spill. I have a 3 x3 piece of cloth and Tom's soap that I keep in a re-purposed eye drop container. This little freezer bag wash basin is my salvation when I'm hot, dusty, grimy and stinky.
It just feels good to get in my sleeping bag a little cleaner than I was. My other favorite is a small piece of deodorant stone. It helps to apply this after bathing and at the beginning of the hiking day. Just passing it on.